Anticorrosive waterborne polyurethane coatings derived from castor oil and renewable diols

Shen, Rulin; Long, Mingjun; Lei, Chendong; Dong, Liming; Yu, Guipeng; Tang, Juntao

doi:10.1016/j.cej.2021.134470

Cited by 75 publications

(24 citation statements)

References 48 publications

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“…Although a surfeit of research has been carried out with CO in synthesizing PUs of desired properties, very less work has been done in the core structure modification of CO to be used in PUs preparation 21 . Most of the work on CO‐based PU preparation has been executed by end group modification (or terminal functionalization) of CO. For example, Shen et al prepared waterborne PU systems by end functionalization of CO with different diols for exhibiting anti‐corrosive performance and achieved maximum water contact angle (WCA) of 92.8° 40 . While, Wei et al used polydimethylsiloxane for end group modification of CO to prepare PU antismudge coatings, however the maximum WCA was 103.8° 41 .…”

Section: Introductionmentioning

confidence: 99%

“…21 Most of the work on CO-based PU preparation has been executed by end group modification (or terminal functionalization) of CO. For example, Shen et al prepared waterborne PU systems by end functionalization of CO with different diols for exhibiting anticorrosive performance and achieved maximum water contact angle (WCA) of 92.8 . 40 While, Wei et al used polydimethylsiloxane for end group modification of CO to prepare PU antismudge coatings, however the maximum WCA was 103.8 . 41 Li et al used a short fluorine segment as chain extender to develop CO-based PU system, but the maximum WCA was 86.17 .…”

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confidence: 99%

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Development of hydrophobic polyurethane film from structurally modified castor oil and its anticorrosive performance

Mohanty

Borah

Kashyap

et al. 2022

Polymers for Advanced Techs

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Hydrophobic polyurethane (PU) films are widely used for various commercial and industrial applications due to their excellent water repelling and self-cleaning property. Nevertheless, achieving appreciable hydrophobicity in PU film is quite a challenge. Herein, we report on the development of a novel hydrophobic PU (fluorinated polyurethane [FCO-PU]) film and comprehensively evaluate its anticorrosive property. The FCO-PU was prepared by structural modification of castor oil (CO) through attachment of long fluorocarbon chains as pendant groups onto the backbone of CO. A model PU film (CO-PU) was also prepared from unmodified CO to compare the properties of FCO-PU film. All intermediate compounds, FCO-PU and CO-PU films were characterized by various spectroscopic techniques. Morphological, thermal and mechanical properties of the PU films were analyzed by field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and dynamic mechanical thermal analysis (DMTA) studies. Successful introduction of long fluorocarbon chains into the FCO-PU film is reflected by its high hydrophobicity with a water contact angle of 119.1 , compared to the model CO-PU film with a water contact angle of 84.4 . Anticorrosive properties of the PU films were evaluated by polarization technique and electrochemical impedance spectroscopy under corrosive environment and the obtained results reveal a significant corrosion resistance (corrosion rate: 6.72 Â 10 À6 mm/year) behavior by the FCO-PU film. This work represents an effective strategy for the backbone modification of CO to develop novel functional PU materials.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Development of hydrophobic polyurethane film from structurally modified castor oil and its anticorrosive performance

Mohanty

Borah

Kashyap

et al. 2022

Polymers for Advanced Techs

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“…It can be obtained mainly from fermentation products of carbohydrates such as corn, potato, and sugar cane. [4,54,55] Besides, ethylene glycol (EG) can be derived from cellulose in the catalytic conversion process, [56,57] and the simplest dicarboxylic acid, oxalic acid (OA), can be derived from glucose. [58][59][60] As an essential ingredient of the UPRs, reactive monomer exerts significant effects on the resin properties as well.…”

Section: Introductionmentioning

confidence: 99%

Highly Bio‐Based Unsaturated Polyester Resins with Improved Performance by Incorporating Isosorbide into the Polyester Prepolymer

Qu²,

Dai

et al. 2022

Macro Materials & Eng

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Herein, the successful design of a highly bio‐based family of unsaturated polyester resins (UPRs) is presented, comprising of an isosorbide (ISO) incorporated unsaturated polyester prepolymer (UP) and a reactive diluent of 4‐vinylguaiacol acetyl ester (ACVG). A series of UPs are prepared by copolymerizing ISO with other green monomers, i.e., itaconic acid, ethylene glycol and oxalic acid, in a variation of ISO fraction. The UP/ACVG mixtures exhibit very low viscosity ranging from 2.8 to 3.7 Pa s. After curing at 135 °C to form a network, the resulting thermosets exhibit remarkable improvements in terms of glass transition (Tg, about 131 °C), storage modulus (2564–3342 MPa), and tensile strength (around 76.6 MPa), which are significantly better than the UP thermosets reported in previous works, The incorporation of ISO units into the UPs reveals a favorable effect on thermal stability of the thermosets as well. The best Td5% is measured to be 320.4 °C, and the volatile molecular information collected using a TGA‐GC/MS set suggests that the decomposition mechanism of the cross‐linked resins becomes heat‐resistant due to the ISO incorporation. Moreover, after being reinforced by cotton fabrics, an outstanding compatibility between the ISO containing UPRs and cotton fibers is found to be suitable for composite fabrication.

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“…Replacing them with renewable alternatives like lignin, cellulose and vegetable oils that have a low environmental impact has become the new research trend. 2 Zhang et al reported that among all the renewable resources vegetable oils are most frequently employed for the preparation of polymeric materials for their structural advantages as well as their ease of availability, low price and potential degradability. Additionally, due to the hydrophobicity of plant oils, the resultant polymeric materials become hydrophobic.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of castor oil‐based polyols applicable in acrylated polyurethane coating with improved mechanical properties

Mohanty

Kanny

2022

Polymer International

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The study focuses on the synthesis of polyurethane (PU)‐based coating from modified castor oil (CO) via an in situ polymerization process. CO was modified by employing multiple process steps, that included epoxidation, followed by transesterification and acrylation to get the required polyol for PU synthesis. The structural properties were studied using Fourier transform infrared and 1H NMR spectra. Thermogravimetric analysis (TGA) and differential scanning calorimetry revealed an increase in the final degradation temperature and glass transition temperature from 358 and −46.58 °C to 368 and −37.43 °C respectively after transesterification followed by acrylation of epoxidized CO. Hydroxyl value, acid value, amine value and viscosity were observed to change from 208 mg/KOH, 1.75, 13.09 and 428 mPa s to 233 mg/KOH, 1.16, 19.53 and 318 mPa s after transesterification and acrylation of epoxidized CO. Paint formulations at variable OH:NCO ratios like 1:0.9, 1:1 and 1:1.1 were optimized by following the cross‐cut tape test, lap‐shear test, abrasion resistance test and pencil hardness test. Crosslinking density of the paint samples was calculated and the morphological properties of the optimized coating sample were studied using a scanning electron microscope. TGA was carried out to study the thermal properties of the coating. © 2022 Society of Chemical Industry.

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Anticorrosive waterborne polyurethane coatings derived from castor oil and renewable diols

Cited by 75 publications

References 48 publications

Development of hydrophobic polyurethane film from structurally modified castor oil and its anticorrosive performance

Development of hydrophobic polyurethane film from structurally modified castor oil and its anticorrosive performance

Highly Bio‐Based Unsaturated Polyester Resins with Improved Performance by Incorporating Isosorbide into the Polyester Prepolymer

Synthesis of castor oil‐based polyols applicable in acrylated polyurethane coating with improved mechanical properties

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